Clam AntiVirus is an anti-virus toolkit designed especially for email
scanning on mail gateways. It provides a number of utilities, including
a flexible and scalable multi-threaded daemon, a commandline scanner,
and a tool for automatic database updates. The core of the package is an
anti-virus engine available as a shared library.

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John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. It supports several crypt(3) password hash types commonly found on Unix systems, as well as Windows LM hashes. On top of this, lots of other hashes and ciphers are added in the community-enhanced version (-jumbo), and some are added in John the Ripper Pro.

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GnuPG (the GNU Privacy Guard or GPG) is GNU's tool for secure communication and data storage. It can be used to encrypt data and to create digital signatures. It includes an advanced key management facility and is compliant with the proposed OpenPGP Internet standard as described in RFC2440. As such, it is meant to be compatible with PGP from NAI, Inc. Because it does not use any patented algorithms, it can be used without any restrictions.

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Lynis is an security auditing and hardening tool for Unix derivatives like Linux/BSD/Solaris. It performs an in-depth scan on the system to detect software and security issues. Besides information related to security, it will also scan for general system information, installed packages, and possible configuration mistakes. The software is aimed at assisting automated auditing, configuration management, software patch management, vulnerability detection, and malware scanning of Unix-based systems.

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Nmap ("Network Mapper") is a utility for network
exploration, administration, and security
auditing. It uses IP packets in novel ways to
determine which hosts are available online (host
discovery), which TCP/UDP ports are open (port
scanning), and what applications and services are
listening on each port (version detection). It can
also identify remote host OS and device types via
TCP/IP fingerprinting. Nmap offers flexible target
and port specifications, decoy/stealth scanning
for firewall and IDS evasion, and highly optimized
timing algorithms for fast scanning.